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b in (-oo:+oo)
b/9+1/4 = 11 // - 11
b/9+1/4-11 = 0
1/9*b-43/4 = 0 // + 43/4
1/9*b = 43/4 // : 1/9
b = 43/4/1/9
b = 387/4
b = 387/4
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